Calculate the percentage by mass of nitrogen in ammonia
relative atomic masses ar : h=1; n =14

Which element is the least metallic between cadmium, silver, zinc, or iron?

Which of the following shapes would represent a molecule with two bonded atoms and 3 lone pairs on only one of them , trigonal planar , bent , trigonal pyramidal , linear

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.